Samuel g



UNITED STATES PATENT OEEICE.

SAMUEL G. Goss, oE

OF SAME PLACE.

CYLINDER FOR ROTARY PRINTING-PRESSES.

SPECIFICATION forming part of Letters Patent No. 461,188, dated October 13, 1891.

Application filed March 5,1890. Serial No. 342,779. (No model.)

To @ZZ t'hom it may concern.-

Be it known that I, SAMUEL G. GOSS, residing at Chcago,in the county of Cook and State of Illinois, and a citizen of the United States, have invented a new and useful Improvement in Cylinders for Rotary Printing- Presses, of which the following` is a specification, reference being had to the accompanying drawings, in Which- Figure l is a side elevation of one of the cylinders. Fig. 2 is a vertical longitudinal section. Fig. 3 is a side elevation, one part of the cylinder being removed. Fig. 4 is a side elevation of that portion of the cylinder which is removed from Fig. 3. Fig. 5 is an end View of one of the cylinders, and Fig. 6 is a section at line 6 of Fig. l.

The object of my invention is to construct the cylinders of yprinting-presses in two parts, one of which shall be fast to the shaft of the cylinder and the other of which may be loose on the shaft so that the two parts of the cylinder can be run at different speeds, which I accomplish as illustrated in the drawings and as hereinafter described. That which I claim as new will be set forth in the claims.

In the drawings, A represents a plate-cylinder, which is made in two parts B C. The part Bis secured to its shaftD in anyknown manner and rotates with such shaft. The part C is provided with journal-bearings a, which receive the shaft I), on which shaft this part C can rotate. Each of the parts B C of 'the cylinder A is designed to receive stereotype-plates, and hence are provided with grooves b and with screws and sliding clamps c, as usual. In addition to these clamps c I have shown near the longitudinal center of the part B of the cylinder sliding-pieces d, which project a little beyond the cylinder and move in slots therein and are undercut to receive the ends of stereotype-plates. Thus the part B of the cylinder, as shown, is adapted to receive two sets of stereotype-plates and the part C one set. n

Fig. 3 is the same as Fig. 1, except that the, part C of the cylinder, shown in Fig. l, is removed froin Fig. 3 and shown by itself in Fig. 4.

A gear-wheel can be mounted on the proj ecting end e of the journal-bearing of the 5o cylinder C, so thatby propel' mechanism such part C can be rotated at any desired speed and at a speed different-from ihat at which the part B rotates. This part B is also driven by means of suitable gearing, as is usual. I have provided a sliding-rod, indicated by dotted lines f, which passes through the two ends of the cylinder C and enters a hole vin the adjoining end of the cylinder B, so that When desired the two part-s B C can be thus 6o connected so that they will rotate'in unison,

vboth being driven by the movement of the shaft D.

g are oiling-passages for the journal-bearings of the cylinder C. The cylinder shown in the drawings is a plate-cylinder, but a blanket-cylinder can be made in substantially the same manner-that is to say, one part being fast to its shaft and the other part loose thereon, both parts being 7o provided with suitable devices for receiving and holding blankets, as usual.

What I claim as new, and desire to secure by Letters Patent, is as follows:

l. A printing-press cylinder divided vertically into two parts, both of-which are mounted directly upon a single rotary shaft which is common to both parts of the cylinder, one part of the cylinder being rigidly secured to and turning with the rotary shaft and the 8o other part of the cylinder being loosely mounted on and adapted to rotate independently of said rotary shaft so that the two parts of the cylinder may when necessary be rotated at different speed on the one shaft, 85

substantially as described.

specilied.

SAMUEL G. GOSS. lrVitnesses:

ALBERT H. ADAMS, ROBERT A. MILLAR. 

